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- Hydraulics of stepped spillways : current status
- Hydraulics Of Stepped Chutes And Spillways By Hubert Chanson
- Hydraulics of Stepped Chutes and Spillways
Hydraulics of stepped spillways : current status
Chanson, , H. January ; 56 1 : B10—B Hydraulics of Stepped Chutes and Spillways. Balkema Publ, Rotterdam, Netherlands. ISBN This book provides a comprehensive coverage of most of the engineering topics in the hydraulic design of stepped chutes and spillways. The stepped channels and chutes have been in use for more than years, but there is no publication on the hydraulic design of these structures.
In the present study, energy dissipation was investigated in a specific type of stepped spillways. The purpose was to achieve the highest level of energy dissipation in downstream of the spillway. It was performed by providing a specific type of geometry for step as a great roughness. Here, steps were recognized as great roughness against flow. Their shape and number were designed in such a way that the maximum flow energy can be minimized in this stage, i. Accordingly, it can be stated that the highest energy dissipation rate will be obtained in the structure at downstream.
Hydraulics Of Stepped Chutes And Spillways By Hubert Chanson
A stepped spillway is a spillway with steps on the spillway chute to assist in the dissipation of the kinetic energy of the descending water. This eliminates or reduces the need for an additional energy dissipator, such as a body of water, at the end of the spillway downstream. Stepped spillways, consisting of weirs and channels, have been used for over 3, years since the first structures were built in Greece and Crete. During Antiquity , the stepped chute design was used for dam spillways, storm waterways, and in the town water supply channels. Most of these early structures were built around the Mediterranean Sea , and the expertise on stepped spillway design was spread successively by the Romans, Muslims and Spaniards. Although the early stepped spillways were built in cut-stone masonry, unlined rock and timber, a wider range of construction materials was introduced during the midth century, including the first concrete stepped spillway of the Gold Creek dam in Brisbane, Australia. During the first half of the 20th century, the stepped cascade design became out of fashion, partly because of the maintenance costs but also because of the development in hydraulic jump stilling basins.
The stepped channel design have been used for more than 3, years chapter 2. A significant number of dams were built with overflow stepped spillways during the 19th century and early 20th century, before the design technique became outdated with the progresses in hydraulic jump stilling basin design. Recent advances in technology e. RCC, polymer-coated gabion wire have triggered a regain in interest for the stepped design, although much expertise had been lost in the past 80 years. The steps increase significantly the rate of energy dissipation taking place along the chute and reduce the size of the required downstream energy dissipation basin. Stepped cascades are used also in water treatment plants to enhance the air-water transfer of atmospheric gases e. Research on stepped spillway hydraulics has been active between and
Moghaddam, Amir Kamyab and Ketabdar, Milad and Amir Ahmadian, Sepideh and Hoseini, Pedram and Pishdadakhgari, Mohammadali : Experimental survey of energy dissipation in nappe flow regime in stepped spillway equipped with inclined steps and sill. Stepped spillway increases the hydraulic resistance against flow by using of step-made spillway floor and when the flow of water passing on steps, a significant part of energy dissipates and also reduces the risk of cavitation. In this experimental research, in order to increase the energy dissipation of stepped spillway, Steps has a reverse gradient and in other part of this tests in addition to create a reverse gradient in the steps at the same time the sill is also installed on the edge of the steps. Height, thickness of the sills is considered variable. The results show that in both Nappe Flow Regime and Skimming Flow Regime Change of gradient, sills height, thickness are effective to increase the energy loss but the effect of these parameters on the Nappe Flow Regime is much greater than Skimming Flow Regime. By analyzing the results of the experiments and compared with results from other studies, the research showed that the method used in this study has a better energy loss than other methods used in prior researches. Sorensen, "Stepped spillway hydraulic model investigation," Journal of hydraulic Engineering, vol.
Hydraulics of Stepped Chutes and Spillways
Stojnic, Ivan. Advances in dam construction techniques have significantly increased the number of implemented stepped spillways worldwide. A key hydraulic feature of a stepped chute, compared to a smooth chute, is the enhanced energy dissipation resulting in a reduced residual energy at the chute end. Nevertheless, stepped chutes provide only a partial energy dissipation, so that an adequate dissipation structure may be still required at the chute end.
An important part in designing stepped spillways is making the spillway in order to direct the flow appropriately on the first step.
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